Pictures of the Ravens game against the Cincinnati Bengals in Week 17.

Aaron WilsonThe Baltimore Sun

Ravens rookie cornerback Asa Jackson has been suspended without pay for the team’s next four games for violating the NFL policy on performance enhancing substances, according to NFL spokesman Corry Rush.

The suspension stems from usage of Adderall, not steroids, according to a source with knowledge of the situation.

Jackson’s suspension begins immediately and will cost him four game checks totaling $91,764 at $22,941 per week.

If Baltimore clinches a playoff spot, Jackson will be eligible to return to the Ravens’ active roster on the day following the team’s first playoff game.